<template>
    <div class="login_contarner">
        <div class="login_box">
            <!-- Logo显示区域 -->
            <div class="login_box_logo">
                <img src="../assets/logo.png" alt="图标">
            </div>
            <!-- 登陆表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFromRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                 <el-form-item prop="password">
                    <el-input type="password" v-model="loginForm.password" prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登陆</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>

    </div>
</template>

<script>
export default {
    data () {
        return {
            // 登陆表单的数据绑定对象
           loginForm: {
               username: 'admin',
               password: '123456'
           },
           // 表单的验证规则对象
           loginFromRules: {
            // 验证用户名是否合法
               username: [
                 { required: true, message: '请输入用户名称', trigger: 'blur' },
                 { min: 4, max: 10, message: '长度在 4 到 10个字符', trigger: 'blur' }
            ],
            // 验证密码是否合法
               password: [
                 { required: true, message: '请输入用户密码', trigger: 'blur' },
                 { min: 6, max: 16, message: '长度在 6 到 16个字符', trigger: 'blur' }
               ]

           }

        }
    },
    methods: {
        // 点击重置按钮，重置登陆表单
        resetLoginForm () {
            this.$refs.loginFormRef.resetFields()
        },
        login () {
            this.$refs.loginFormRef.validate(async valid => {
                // console.log(valid)
                if (!valid) return
                const { data: res } = await this.$http.post('login', this.loginForm)
                if (res.meta.status !== 200) return this.$message.error('登陆失败！')
                this.$message.success('登陆成功')
                window.sessionStorage.setItem('token', res.data.token)
                // 通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push('/home')
            })
        }

    }
}

</script>

<style lang="less" scoped>
.login_contarner{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 500px;
    height: 350px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);

    .login_box_logo{
        width: 130px;
        height: 130px;
        border:1px solid #ddd;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px ;
    box-sizing: border-box;
}

.btns{
    display: flex;
    justify-content: center;
}
</style>
